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<?php
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2014 - 2018, British Columbia Institute of Technology
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @package     CodeIgniter
 * @author      EllisLab Dev Team
 * @copyright   Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
 * @copyright   Copyright (c) 2014 - 2018, British Columbia Institute of Technology (http://bcit.ca/)
 * @license     http://opensource.org/licenses/MIT      MIT License
 * @link        https://codeigniter.com
 * @since       Version 3.0.0
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * PDO PostgreSQL Database Adapter Class
 *
 * Note: _DB is an extender class that the app controller
 * creates dynamically based on whether the query builder
 * class is being used or not.
 *
 * @package             CodeIgniter
 * @subpackage  Drivers
 * @category    Database
 * @author              EllisLab Dev Team
 * @link                https://codeigniter.com/user_guide/database/
 */
class CI_DB_pdo_pgsql_driver extends CI_DB_pdo_driver {

        /**
         * Sub-driver
         *
         * @var string
         */
        public $subdriver = 'pgsql';

        /**
         * Database schema
         *
         * @var string
         */
        public $schema = 'public';

        // --------------------------------------------------------------------

        /**
         * ORDER BY random keyword
         *
         * @var array
         */
        protected $_random_keyword = array('RANDOM()', 'RANDOM()');

        // --------------------------------------------------------------------

        /**
         * Class constructor
         *
         * Builds the DSN if not already set.
         *
         * @param       array   $params
         * @return      void
         */
        public function __construct($params)
        {
                parent::__construct($params);

                if (empty($this->dsn))
                {
                        $this->dsn = 'pgsql:host='.(empty($this->hostname) ? '127.0.0.1' : $this->hostname);

                        empty($this->port) OR $this->dsn .= ';port='.$this->port;
                        empty($this->database) OR $this->dsn .= ';dbname='.$this->database;

                        if ( ! empty($this->username))
                        {
                                $this->dsn .= ';username='.$this->username;
                                empty($this->password) OR $this->dsn .= ';password='.$this->password;
                        }
                }
        }

        // --------------------------------------------------------------------

        /**
         * Database connection
         *
         * @param       bool    $persistent
         * @return      object
         */
        public function db_connect($persistent = FALSE)
        {
                $this->conn_id = parent::db_connect($persistent);

                if (is_object($this->conn_id) && ! empty($this->schema))
                {
                        $this->simple_query('SET search_path TO '.$this->schema.',public');
                }

                return $this->conn_id;
        }

        // --------------------------------------------------------------------

        /**
         * Insert ID
         *
         * @param       string  $name
         * @return      int
         */
        public function insert_id($name = NULL)
        {
                if ($name === NULL && version_compare($this->version(), '8.1', '>='))
                {
                        $query = $this->query('SELECT LASTVAL() AS ins_id');
                        $query = $query->row();
                        return $query->ins_id;
                }

                return $this->conn_id->lastInsertId($name);
        }

        // --------------------------------------------------------------------

        /**
         * Determines if a query is a "write" type.
         *
         * @param       string  An SQL query string
         * @return      bool
         */
        public function is_write_type($sql)
        {
                if (preg_match('#^(INSERT|UPDATE).*RETURNING\s.+(\,\s?.+)*$#is', $sql))
                {
                        return FALSE;
                }

                return parent::is_write_type($sql);
        }

        // --------------------------------------------------------------------

        /**
         * "Smart" Escape String
         *
         * Escapes data based on type
         *
         * @param       string  $str
         * @return      mixed
         */
        public function escape($str)
        {
                if (is_bool($str))
                {
                        return ($str) ? 'TRUE' : 'FALSE';
                }

                return parent::escape($str);
        }

        // --------------------------------------------------------------------

        /**
         * ORDER BY
         *
         * @param       string  $orderby
         * @param       string  $direction      ASC, DESC or RANDOM
         * @param       bool    $escape
         * @return      object
         */
        public function order_by($orderby, $direction = '', $escape = NULL)
        {
                $direction = strtoupper(trim($direction));
                if ($direction === 'RANDOM')
                {
                        if ( ! is_float($orderby) && ctype_digit((string) $orderby))
                        {
                                $orderby = ($orderby > 1)
                                        ? (float) '0.'.$orderby
                                        : (float) $orderby;
                        }

                        if (is_float($orderby))
                        {
                                $this->simple_query('SET SEED '.$orderby);
                        }

                        $orderby = $this->_random_keyword[0];
                        $direction = '';
                        $escape = FALSE;
                }

                return parent::order_by($orderby, $direction, $escape);
        }

        // --------------------------------------------------------------------

        /**
         * Show table query
         *
         * Generates a platform-specific query string so that the table names can be fetched
         *
         * @param       bool    $prefix_limit
         * @return      string
         */
        protected function _list_tables($prefix_limit = FALSE)
        {
                $sql = 'SELECT "table_name" FROM "information_schema"."tables" WHERE "table_schema" = \''.$this->schema."'";

                if ($prefix_limit === TRUE && $this->dbprefix !== '')
                {
                        return $sql.' AND "table_name" LIKE \''
                                .$this->escape_like_str($this->dbprefix)."%' "
                                .sprintf($this->_like_escape_str, $this->_like_escape_chr);
                }

                return $sql;
        }

        // --------------------------------------------------------------------

        /**
         * List column query
         *
         * Generates a platform-specific query string so that the column names can be fetched
         *
         * @param       string  $table
         * @return      string
         */
        protected function _list_columns($table = '')
        {
                return 'SELECT "column_name"
                        FROM "information_schema"."columns"
                        WHERE LOWER("table_name") = '.$this->escape(strtolower($table));
        }

        // --------------------------------------------------------------------

        /**
         * Returns an object with field data
         *
         * @param       string  $table
         * @return      array
         */
        public function field_data($table)
        {
                $sql = 'SELECT "column_name", "data_type", "character_maximum_length", "numeric_precision", "column_default"
                        FROM "information_schema"."columns"
                        WHERE LOWER("table_name") = '.$this->escape(strtolower($table));

                if (($query = $this->query($sql)) === FALSE)
                {
                        return FALSE;
                }
                $query = $query->result_object();

                $retval = array();
                for ($i = 0, $c = count($query); $i < $c; $i++)
                {
                        $retval[$i]                     = new stdClass();
                        $retval[$i]->name               = $query[$i]->column_name;
                        $retval[$i]->type               = $query[$i]->data_type;
                        $retval[$i]->max_length         = ($query[$i]->character_maximum_length > 0) ? $query[$i]->character_maximum_length : $query[$i]->numeric_precision;
                        $retval[$i]->default            = $query[$i]->column_default;
                }

                return $retval;
        }

        // --------------------------------------------------------------------

        /**
         * Update statement
         *
         * Generates a platform-specific update string from the supplied data
         *
         * @param       string  $table
         * @param       array   $values
         * @return      string
         */
        protected function _update($table, $values)
        {
                $this->qb_limit = FALSE;
                $this->qb_orderby = array();
                return parent::_update($table, $values);
        }

        // --------------------------------------------------------------------

        /**
         * Update_Batch statement
         *
         * Generates a platform-specific batch update string from the supplied data
         *
         * @param       string  $table  Table name
         * @param       array   $values Update data
         * @param       string  $index  WHERE key
         * @return      string
         */
        protected function _update_batch($table, $values, $index)
        {
                $ids = array();
                foreach ($values as $key => $val)
                {
                        $ids[] = $val[$index]['value'];

                        foreach (array_keys($val) as $field)
                        {
                                if ($field !== $index)
                                {
                                        $final[$val[$field]['field']][] = 'WHEN '.$val[$index]['value'].' THEN '.$val[$field]['value'];
                                }
                        }
                }

                $cases = '';
                foreach ($final as $k => $v)
                {
                        $cases .= $k.' = (CASE '.$val[$index]['field']."\n"
                                .implode("\n", $v)."\n"
                                .'ELSE '.$k.' END), ';
                }

                $this->where($val[$index]['field'].' IN('.implode(',', $ids).')', NULL, FALSE);

                return 'UPDATE '.$table.' SET '.substr($cases, 0, -2).$this->_compile_wh('qb_where');
        }

        // --------------------------------------------------------------------

        /**
         * Delete statement
         *
         * Generates a platform-specific delete string from the supplied data
         *
         * @param       string  $table
         * @return      string
         */
        protected function _delete($table)
        {
                $this->qb_limit = FALSE;
                return parent::_delete($table);
        }

        // --------------------------------------------------------------------

        /**
         * LIMIT
         *
         * Generates a platform-specific LIMIT clause
         *
         * @param       string  $sql    SQL Query
         * @return      string
         */
        protected function _limit($sql)
        {
                return $sql.' LIMIT '.$this->qb_limit.($this->qb_offset ? ' OFFSET '.$this->qb_offset : '');
        }

}